Recently i had purchased a graphics Color TFT lcd with Touch screen from Taiwan. I m not sure abt the manufacturer of the lcd. The size is 5.7" with 640x480 resolution and 4- wire resistance interface for TSCR.
The LCD module is having Source and Gate Driver IC namely HX8250A and HX8678A. The output of the module has 18-bit parallel TTL interface(Red - R0 to R5, Green - G0 to G5, Blue - B0 to B5).Along with this HSYNC,VSYNC, DE,CLK are also present.
But i m not sure how to write a application program for the lcd module. As i dont have any datasheet of the LCD module i m not quite sure where should i start from and how to write the program for this?
Anybody can suggest in this??
There are MCU's that have an external DRAM interface as well as a graphics controller on-chip. Have a look at LPC2478 for an example. If replacing the MCU is not an option, I think some graphics controllers can do the job. That is, if a graphics controller has two busses (one for DRAM and one for MCU) then it can expose the DRAM to the MCU for general-purpose programming. I've worked with the Fujitsu Jasmine GPU and it does just that, if I'm not mistaken. The Fujitsu Jasmine had its DRAM on-chip, though. I'm sure there are other examples. One word of caution. When sharing the same DRAM between display buffer and general-purpose memory you have to remember that scanning the display buffer for LCD refresh takes up memory bandwidth. That bandwidth will not be available to the MCU.